Evaluation of Civil Defense Radiological Instruments,
FEDERAL CIVIL DEFENSE ADMINISTRATION WASHINGTON D C
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Experiments were conducted during Operation Plumbbob 1 to investigate the beta-gamma exposure-rate ratio from fallout to establish design criteria for high-range beta-gamma survey instruments and 2 to evaluate existing civil defense radiological instruments. Results of these investigations confirm results obtained in Operation Teapot WT-1190. Conclusions reported in WT-1190 were that design criteria for the high-range instrument, CD V-720, agreed with the requirements for such an instrument. The item of major interest was the effect of a 50 mgsq cm window on the attenuation of beta radiation from fallout. Experiments showed that the component of the total quantity of beta radiation absorbed by the window, and not indicated by the instrument, was small enough that its contribution to the total hazard was insignificant. Recommendations made in WT-1190 were to 1 develop satisfactory instrument-calibration facilities and 2 use sealed ionization chambers to eliminate the change in sensitivity of survey meters as a function of altitude. These recommendations were accepted and incorporated in ionization type survey-meter specifications.
- Civil Defense